Question

1.) Calculate the drag force due to air resistance on a 3" diameter disk with a thickness of 1.5” moving through the air at 90 miles per hour, with an air temperature of 50 deg F and air pressure of 14.7 psi. Viscosity of air=1.778x10^-5 kg/m-s

Answer #1

62. (a) Calculate the retarding force due to
the viscosity of the air layer between a cart and a level air track
given the following information—air temperature is 20º
C, the cart is moving at 0.400 m/s, its surface area is
2.50×10−2m22.50×10−2m2, and the thickness of the air layer is
6.00×10−5m6.00×10−5m.
(b) What is the ratio of this force to the weight of the
0.300-kg cart?

A settling chamber is measuring 6 meters in length, 3 meters in
width, and 1.5 meters in height. The air stream flowrate entering
the chamber is 17 m3/s, and the average particle size (diameter) is
65 micrometers. Assume a particle density of 1800 kg/m3 and that
Stokes law applies.
Some properties of air:
Atmospheric pressure = 101.4 kPa = 14.7 psi
Air density = 1.2 kg/m3.
Air viscosity = 1.85x 10^-5 Pa.s.
the air stream horizontal velocity in the chamber...

Very small objects, such as dust particles, experience a
linear drag force, D⃗ D→ = (bv, direction opposite the
motion), where b is a constant. For a sphere of radius R, the drag
constant can be shown to be b=6πηR, where η is the
viscosity of the gas.
Suppose a gust of wind has carried a 52-μm-diameter dust
particle to a height of 260 m. If the wind suddenly stops, how long
will it take the dust particle to settle...

In addition to the buoyant force, an object moving in a liquid
experiences a linear drag force Fdrag = (bv, direction opposite the
motion), where b is a constant. For a sphere of radius R, the drag
constant can be shown to be b = 6πηR, where η is the viscosity of
the liquid. Consider a sphere of radius R and density ρ that is
released from rest at the surface of a liquid with density ρf.
a. Find an...

A small rocket probing the atmosphere has a length of 3 m. It is
fired vertically upward through the atmosphere, its average
velocity being 1000 m/s. Consider the flow over the rocket at this
average velocity at altitudes of 30,000 and 80,000 m. Can the air
flow over the rocket be assumed to be continuous at these two
altitudes? At an altitude of 30,000 m, the air has a temperature,
pressure, and viscosity of ?55°C, 120 Pa, and 1.5 ×...

12) There are several types of drag on a car other than air
resistance. Effects having to do with the squeezing of the tires
(rolling resistance) and frictional forces in the drivetrain (the
system that transfers energy from the engine to the rotation of the
wheels) also must be taken into account. Engineers use the
following equation to model the total force due to these different
effects Fdrag=A+Bv+Cv^2 For a Camry, these coefficients are
estimated to be A=117.130 N, B=1.800...

12) There are several types of drag on a car other than air
resistance. Effects having to do with the squeezing of the tires
(rolling resistance) and frictional forces in the drivetrain (the
system that transfers energy from the engine to the rotation of the
wheels) also must be taken into account. Engineers use the
following equation to model the total force due to these different
effects
Fdrag=A+Bv+Cv2Fdrag=A+Bv+Cv2
For a Camry, these coefficients are estimated to be
A=117.130A=117.130 N, B=1.800...

12) There are several types of drag on a car other than air
resistance. Effects having to do with the squeezing of the tires
(rolling resistance) and frictional forces in the drivetrain (the
system that transfers energy from the engine to the rotation of the
wheels) also must be taken into account. Engineers use the
following equation to model the total force due to these different
effects
Fdrag=A+Bv+Cv2Fdrag=A+Bv+Cv2
For a Camry, these coefficients are estimated to be
A=117.130A=117.130 N, B=1.800...

Air at 373°C and 121 kPa flows through a horizontal 7 cm
diameter pipe at a speed of 50 m/s. If the air changes temperature
to 375°C at a constant pressure, what is the value of the change in
the flow of kinetic energy? Write your result in J/s.

1. When a parachute opens, the air exerts a large drag force on
it. This upward force is initially greater than the weight of the
sky diver and, thus, slows him down. Suppose the weight of the sky
diver is 913 N and the drag force has a magnitude of 1079 N. The
mass of the sky diver is 93.2 kg. Take upward to be the positive
direction. What is his acceleration, including sign?
2. The space probe Deep Space...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 4 minutes ago

asked 4 minutes ago

asked 12 minutes ago

asked 16 minutes ago

asked 21 minutes ago

asked 28 minutes ago

asked 31 minutes ago

asked 39 minutes ago

asked 41 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago